Excellent news! I bought AH2 in EA right after it was available because I thought it would make flying P3D worthwile again, but it didn't... Don't get me wrong, AH2 is great, but it just can't make P3D any better. 😊

Users which want to try the Beta without losing their stable version can just copy their X-Plane folder (you can symlink to big Custom Sceneries like Orthos), and then update that Copy to the Beta.
But please double check, that the installer is pointing to the copy. It's most likely pointing to the "original" as default.

Yes, you can use Navigraph Charts with the moving map feature on a separate machine in the same network, as long as SimLink is running on the X-Plane machine. You can also use the Charts app on a Tablet or Phone.
This guide should answer most questions: https://forum.navigraph.com/viewtopic.php?f=90&amp;t=5193

I don't know if X-Plane 11 introduced a command for this, there was none in XP10 and I never looked for that funtion. But there's plugin you can use:
https://forums.x-plane.org/index.php?/files/file/35383-xbarometer/
Pressing CTRL+SHIFT+B toggles between the current QNH and 29.92

The default folder is /Output/FMS plans inside the X-Plane 10/11 installation folder.
So it's not a fixed path on every system, but depends on where the user installed X-Plane. Your app either needs an option to let the user point to his/her X-Plane path, or you need to parse the installation path from the file x-plane_install_11.txt or x-plane_install_10.txt in the user's AppData/Local directory.
These files are also present on Linux and Mac installations: https://developer.x-plane.com/article/how-to-programmatically-locate-x-plane-9-or-10/

From a painter's perspective that might be true. For me, the availability of repaints is of no significance for making the decison to buy the addon or not, and in my experience people are looking at other things first (3D model, systems, flight model etc.).

Try it, I think it's wortht it. When I switched to X-Plane 4 or 5 years ago, one of the things that immediately impressed me was the ease of view controls.
Being able to look around in the cockpit with the mouse without having to use two hands (another for the space bar), and having the option to quickly access 10 (now 20 in XP11) freely configurable cockpit views per aircraft without needing an addon like EZDOK were the biggest "wow" factors. 😊

Normally the localhost IP 127.0.0.1 should work.
Now comes the odd part: If the message still occurs, you can increase the 1, restart X-Plane and repeat until it goes away. I don't know why and in which thread I read that trick, but when I was using XPUIP, I had to use 127.0.0.3 for the message to disappear.

Also, with constant speed props, when you want to...
...increase engine power (e.g. climb) you first set the new RPM then the new MP. Readjust if necessary.
...decrease engine power (e.g. descent) you first set the new MP then the new RPM. Readjust if necessary.